cers. She has served on the Board of Scientific Counselors of the National Cancer Institute and the National Institute of Environmental Health Sciences National Toxicology Program and is a past president of the Society of Toxicology. Dr. Walker received her Ph.D. from the Department of Cell Biology at the University of Texas Health Science Center, Southwestern Medical School (Dallas), and completed postdoctoral training at the National Institutes of Health.

Lauren Zeise is chief of the Reproductive and Cancer Hazard Assessment Branch of the California Environmental Protection Agency’s Office of Environmental Health Hazard Assessment. She oversees or is involved in a variety of California’s risk assessment activities, including cancer and reproductive toxicant assessments; development of frameworks and methodologies for assessing toxicity, cumulative impact, nanotechnology, green chemistry/safer alternatives, and susceptible populations; the California Environmental Contaminant Biomonitoring Program; and health risk characterizations for environmental media, food, fuels and consumer products. Dr. Zeise’s research focuses on human interindividual variability, dose response, uncertainty, and risk. She was the 2008 recipient of the Society of Risk Analysis’s Outstanding Practitioners Award. She has served on advisory boards and committees of the Environmental Protection Agency (EPA), Office of Technology Assessment, World Health Organization, and National Institute of Environmental Health Sciences. Dr. Zeise has also served on numerous National Research Council and Institute of Medicine committees and boards. Most recently, she was a member of the Committee to Review EPA’s Title 42 Hiring Authority for Highly Qualified Scientists and Engineers, and the Committee on Use of Emerging Science for Environmental Health Decisions. Dr. Zeise received a Ph.D. from Harvard University.

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